letters patent
plural noun Law.
a written or printed instrument issued by a sovereign power, conferring upon a patentee some right, as the exclusive right to land or the exclusive right to make, use, and sell an invention for a limited time.
Origin of letters patent
Middle English word dating back to 1350–1400
Words nearby letters patent
letterman,
letterpress,
letters,
letters of administration,
letters of credence,
letters patent,
letters testamentary,
letterset,
letterspace,
letterwood,
lettic